AIRDOCTOR 4 in 1 Air Purifier VS. KOIOS Large Air Purifier

True HEPA filter that targets germs in the air while filtering microscopic dust, dander, mold-spores and smoke in a circular motion.

Features an automatic timer that helps to shut-off the unit after 1, 2, 4 or 8 hours of continuous operation. This feature helps to save energy

Equipped with an advanced carbon-filter that helps to eliminate and neutralizes harsh odors caused by cooking, smoking cigarettes and other natural and unnatural gasses.

Room coverage of 322 sq.ft (30 m²).Clean Air Delivery Rate-CADR (m³/h): 340 m³/H for Large Room

The HEPA-filter removes up-to 99.97% germs, bacteria and allergens from your house. Your home will be kept germ-free at all times

Yes - It traps and eliminates dust-mites and microscopic dust using the HEPA filter

It uses an advanced HEPA-filter to capture and eliminate pet-dander while its pre-filter will help to trap pet and human hair coupled with other large-contaminants

Uses 3-in-1 Air Filter Technology to remove 99.97% of pollen and other particles as small as 0.3-microns

Uses a carbon-filter to eliminate and neutralize smoke, harsh odors caused by cooking and other natural and unnatural gasses.

Uses a True HEPA filter to trap and filter mold-spores, dust, dander and smoke in a circular motion and after releases purely clean air

The True HEPA filter traps and eliminates common allergy-triggers including; pollen dust-mites, mold and other particles within air.

Maximum noise: <50dB - Features a Whisper-Quiet Sleep Mode which requires you to switch this device into sleep-mode so that it can operate at quiet level.

Features a washable pre-filter that helps to capture large dust-particles and hair. However, the other 2-filters to be replaced every 6 months

The design of this device makes it very easy to replace the filters and the integrated replacement reminder will let you know when it’s time to change the filters

It has an auto mode which allows the fan-speed to automatically adjust basing on the live air quality sensor measurements.

This device features a Quiet Sleep Mode that can be turned-on to allow the unit to operate at quietest level of about 18-db.

Power: <2W, Input: 110V / 50Hz

Features a filter replace indicator that will help to remind you when it’s time to change the filters. 1 single filter requires to be replaced every 6-months

Cpnsumes less power yet it captures and eliminates 99% of air contaminants

Affordable yet it can trap and remove 99.97% of dust, pollen, smoke, odor, mold spores, pet-dander and other small particles up to 0.3-microns

Clean Air Delivery Rate: 50m³/h ± 10%

HEPA filter should be replaced every 6 months depending on the frequency of use and the air quality in your area.

It has a child-lock button that can be pressed to disable all keys when the unit is under operation.

It is 100% Ozone-Free which makes it safe for the environment since it doesn't emit dangerous chemicals into the atmosphere and within your house.

Compact design – available in white

7.5 x 6.9 x 6.9 in

2.1 lbs